<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: rgba(0, 0, 0, .8);
            height: 100vh;
        }

        a {
            position: relative;
            width: 400px;
            height: 100px;
            line-height: 100px;
            font-size: 35px;
            border-radius: 50px;
            text-align: center;
            text-decoration: none;
            color: #fff;
            background-image: linear-gradient(to right, #03a9f4, #f441a5, #ffeb3b, #09a8f4);
            background-size: 400%;
            z-index: 1;
            text-shadow: 0px 0px 20px #fff;
            animation: sun 8s infinite;
        }

        a::before {
            content: '';
            position: absolute;
            left: -5px;
            top: -5px;
            bottom: -5px;
            right: -5px;
            border-radius: 50px;
            background-image: linear-gradient(to right, #03a9f4, #f441a5, #ffeb3b, #09a8f4);
            background-size: 400%;
            z-index: -1;
            filter: blur(20px);
            animation: sun 8s infinite;

        }


        @keyframes sun {
            100% {
                background-position: -400% 0;
            }
        }
    </style>
</head>

<body>
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</body>

</html>